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    Question

    If the difference between average of first five

    multiples of β€˜x’ and first five multiples of β€˜3x’ is 162, then what is the value of β€˜x’?
    A 22 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 27 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    First five multiples of β€˜x’ are β€˜x’, β€˜2x’, β€˜3x’, β€˜4x’ and β€˜5x’
    Average of first five multiples of β€˜x’ = {(5x + x)/2} = β€˜3x’
    First five multiples of β€˜3x’ are β€˜3x’, β€˜6x’, β€˜9x’, β€˜12x’ and β€˜15x’
    Average of first five multiples of β€˜3x’ = {(15x + 3x)/2} = β€˜9x’
    ATQ;
    9x – 3x = 162
    Or, 6x = 162
    Or, x = 27

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